JP3092746U - Carat weighing machine - Google Patents

Abstract

(57) [Summary] To provide a carat weight measuring device capable of improving workability. Kind Code: A1 A carat weight measuring device includes a measuring unit for measuring the size and size of a jewel, a calculating unit for obtaining a carat weight from a value measured by the measuring unit, and a calculating unit for calculating a carat weight. And a display unit 4 for displaying the carat weight. The calculation unit 3 includes a storage unit 31 that stores a specific gravity and a cut coefficient of the jewel, a selection unit 32 that selects a predetermined specific gravity and a cut coefficient from the storage unit 31, a specific gravity and a cut coefficient selected by the selection unit 32, and a measurement. Calculating means 33 for calculating the carat weight based on the value detected by the detecting means 25 of the section 2;

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

  The present invention relates to a carat weighing machine for measuring the carat weight of jewelry. .

[0002]

[Background technology]

  The quality of gems is evaluated from various viewpoints such as cut and color, one of which is There is an evaluation based on the weight of jewels (carat weight). Evaluation by this carat weight Is widely adopted all over the world.   The carat weight of a gemstone is measured by weighing the gemstone with an electronic balance or the like. However, if the gemstone is already attached to the pedestal such as a ring, the gemstone will be Sometimes it is not possible to weigh yourself.   In this case, use a dial display type gauge to measure the size of the gemstone (depth, (Diameter of the idle part) is measured, and the specific gravity of the gemstone and cut The carat weight is calculated by multiplying by the coefficient of.   In order to calculate this carat weight easily and quickly, we have created a carat conversion table. By applying the measurement results of the gem size and size to this conversion table, the carat weight Is calculated (for example, see Non-Patent Document 1).

[0003]

[Non-Patent Document 1]  Kassoy, Inc., "Kassoy's jewelers gauges", [online], [September 2002 4th Search], Internet <URL: http: //www.kassoy.com./gauges01.htm>

[0004]

[Problems to be solved by the device]

  However, in the method using such a carat conversion table, measurement to the carat conversion table is performed. It is easy to mistype constant values, and calculations must be done carefully. However, it is difficult to improve workability.

[0005]   An object of the present invention is to provide a carat weighing machine capable of improving workability. It is to be.

[0006]

[Means for Solving the Problems]

  Therefore, the present invention aims to achieve the above object by adopting the following configuration. is there.   Specifically, the carat weighing machine of the present invention has a cut portion and a crown portion. Carat weight for measuring carat weight of gems with pavilion and girdle It is a quantity measuring instrument, and it uses a measuring unit that measures the size and size of jewelry and this measuring unit. The calculation part that calculates the carat weight from the determined value and the carat calculated by this calculation part. A display unit for displaying rat weight is provided, and the measurement unit is a base and a base. The movable member provided so as to be movable along the longitudinal direction, and the base and the movable member. The girdle portion of the gemstone, which is provided so as to face each other, has a first diameter and a second diameter which are orthogonal to each other. A pair of first jaws for measuring the diameter and a base and a movable member are provided so as to face each other. And a pair of second pins having a pin formed at the tip for measuring the depth dimension of the gemstone. And a detection means for detecting the amount of movement of the movable member with respect to the base. , The calculation unit is a selection unit that selects a cut coefficient based on the specific gravity and shape of the gemstone. , The specific gravity and cut coefficient selected by the selecting means and the detecting means of the measuring unit And a calculation means for calculating the carat weight of the jewel based on the detected value and It is characterized by

[0007]   Here, the cut coefficient based on the specific gravity and shape of the jewel may be stored in advance. Alternatively, it may be input from the outside.   The display unit may be, for example, one that displays on a screen such as a liquid crystal display. Alternatively, the information may be displayed by stamping on paper or the like.

[0008]   With this configuration of the present invention, there are two ways of measuring the size of the gemstone and calculating the carat weight. The operation can be carried out on a carat weigher. Therefore, gems and other gemstones Compared to the conventional method of calculating carat weight using the conversion table after measuring the size In addition, workability can be improved.   Also, since it is not necessary to perform conversion using the carat conversion table as in the past, the measured value You can prevent mistakes in insertion and calculation errors, and improve the reliability of the obtained carat weight value. Can be made.

[0009]   Usually, holes are formed in the bottom surface of the pedestal to which the jewelry is attached. In this hole Insert the pin provided at the tip of one of the second measuring jaws and insert it into the pedestal. The pin is brought into contact with the pavilion part of the jewelry. And of the other second Joe Abut the pin on the crown of the gem. This will attach the jewelry to the pedestal Even if it is, it is possible to accurately measure the depth dimension of the gemstone. Well In addition, since the jewel can be sandwiched and measured by the pair of first measurement jaws, The first diameter and the second diameter can also be measured accurately. Thus, in the present invention, , Because it has a second jaw and a first jaw having a pin at the tip, The carat weight of the jewel attached to the pedestal can be measured with high accuracy. It

[0010]   At this time, the arithmetic unit stores the specific gravities of a plurality of types of jewels and a plurality of cut coefficients. Storage means for storing the specific gravity and the weight of a predetermined gem from the storage means. It is preferable to select the power factor.   When the specific gravity of jewels is not stored in the storage means and the specific gravity is input during measurement Requires time and effort to check and enter the specific gravity of the gemstone. Also, storage means If only the specific gravity of one gem is stored in the carat of a particular gem, Only the weight can be measured, which is inconvenient.   In the present invention, since the specific gravity and the like of a plurality of types of jewels are stored in the storage means in advance, Convenience of the carat weighing machine, as the measuring machine can be used for various kinds of gems Can be improved.

[0011]   Furthermore, the calculation unit selects a correction value that selects a correction value according to the cutting state of the jewel. Selecting means and the correction value selected by the correction value selecting means, The display unit displays the corrected calculation result. It is preferable to display.   In order to measure the carat weight more accurately, the cutting condition of the gemstone must be taken into consideration. I won't. It is calculated by providing the correction value selection means and the correction means as in the present invention. The reliability of the carat weight value obtained can be further improved.

[0012]   Further, the calculation unit stores in advance a plurality of correction values according to the cut state of the jewel. And a correction value selecting means for selecting a predetermined correction value from the storage means. Preferably selected.   Enter the correction value, select it with the correction value selection unit, and perform the correction with the correction unit. However, in this case, it takes time and effort for inputting. On the other hand, in the present invention, By storing a plurality of correction values in the storage means in advance, the effort of inputting can be saved. It is possible to improve the usability of the carat weighing machine.

[0013]   In addition, a substantially rectangular parallelepiped provided on one end of the base of the measurement unit and on which the display unit is formed. A case having a body shape, the case being orthogonal to the longitudinal direction of the first and second jaws; An operating section for moving the movable member is provided on the side surface of the base. Is preferred.   Since the operation part of the movable member is provided on the side surface of the case, do not hold the case with one hand. However, the movable member can be moved. Therefore, fix the gem with the other hand. Since it can be set, it becomes easy to measure the size and size of the gemstone.

[0014]

[Embodiment of device]

  Embodiments of the present invention will be described below with reference to the drawings.   FIG. 1 shows a carat weighing device 1 of the present embodiment. This carat The weight measuring device 1 is, for example, a jewel 100 attached to a ring 110 that is a pedestal. The carat weight is measured. This gem 100 is shown in FIGS. 2 and 3. Is cut like this, the crown portion 101, the pavilion portion 102, and the girdle portion 1 03, the pavilion portion 102 is embedded in the ring 110, and the girdle portion 1 The crown portion 101 above 03 is projected from the ring 110.   As shown in FIG. 1 and FIG. 4, the carat weight measuring device 1 measures the size of the jewel 100. The carat weight is calculated from the measurement part 2 for measuring the method and the value measured by this measurement part 2. Display for displaying the calculation unit 3 and the carat weight calculated by this calculation unit 3. And part 4.

[0015]   The measurement unit 2 includes a base 21, a pair of first jaws 22A and 22B, and a pair of first jaws 22A and 22B. The two jaws 23A and 23B and the base 21 are movable in the longitudinal direction. The moving member 24 and the detecting means 25 are provided.   The first jaws 22A and 22B are orthogonal to each other on the girdle portion 103 of the jewel 100. The first diameter W and the second diameter L (see FIG. 2) are measured.   The second jaws 23A and 23B measure the depth dimension D (see FIG. 3) of the jewel 100. To do. At the tip of the second jaws 23A, 23B, the length of the base 21 Pins 231A and 231B extending parallel to the direction are provided so as to face each other. The length dimension of the pin 231A is shorter than the length dimension of the pin 231B.

[0016]   Of such jaws 22A, 22B, 23A, 23B, the first jaw 22 A and the second jaw 23A are integrally molded, and are fixed to the base end side of the base 21. Has been.   The first jaw 22B and the second jaw 23B are also integrally formed, and The movable member 2 is arranged so as to face the first jaw 22A and the second jaw 23A, respectively. It is attached to 4. This integrated first jaw 22B and second jaw 22B The cover 241 is attached to the 23B, and the surface of the cover 241 is Has a convex portion 242.

[0017]   The detection means 25 detects the amount of movement of the movable member 24, and the sensor 251. And a demodulation circuit 252 and a counting circuit 253.   The sensor 251 is provided on the movable member 24. As this sensor 251, , For example, a plurality of electrodes arranged at regular intervals along the longitudinal direction of the base 21. It has a plurality of electrodes that are capacitively coupled to a pole (scale), and moves with the movement of the movable member 24. Capacitance measuring sensor that detects the amount of movement of the movable member 24 from the capacitance that changes with Alternatively, other known sensors can be used. The output from the sensor 251 is Corresponding to the moving amount of the movable member 24 in the counting circuit 253 via the adjusting circuit 252. After being counted as a number of pulses, it is detected as a count value.

[0018]   The calculation unit 3 includes a storage unit 31 that stores the specific gravity and the cut coefficient of the jewel, and a storage unit. Selector 32 for selecting a specific gravity and cut coefficient from 31 and selector 32 The selected specific gravity and cut coefficient are detected by the detecting means 25 of the measuring unit 2. And a calculation means 33 for calculating the carat weight based on the value.

[0019]   The storage unit 31 is, for example, a ROM (Read Only Memory) or a RAM (Random  Access Memory), etc., and stores the specific gravity and cutting coefficient of multiple types of gems. There is. For example, in this embodiment, diamond (DA), emerald (EM), Memorize the specific gravity of four types of gemstones, alexandrite (AL) and corundum (CR) Has been done. Also, round brilliant cut, square cut, marquise 6 types of cut, pear shape cut, oval cut, cabochon cut The cut coefficient based on the cut is stored.

[0020]   Whether the selection means 32 has a plurality of types of specific gravity and cut coefficients stored in the storage means 31. It has a function to select a predetermined one from among the functions / Enter switch 511 and And a Select / Cancel switch 512.   The calculation means 33 has a calculation circuit 331 and calculates the count value, specific gravity and cut coefficient by the following equation. Input to (1) to perform calculation.   Carat weight = specific gravity of gem x cut coefficient x first diameter W x second diameter L x depth dimension D ... (1)

[0021]   Further, the arithmetic unit 3 previously records a plurality of correction values according to the cut state of the jewel 100. A memory means 34 for storing and a correction value selecting means for selecting a correction value from the memory means 34. 35 and the carat weight based on the correction value selected by the correction value selecting means 35. Correction means 36 for correcting   The storage means 34 stores four kinds of correction values of -2%, 3%, 5%, and 8%. There is.   The correction value selection means 35 selects one kind of correction value from the four kinds of correction values. Yes, like the selecting means 32, a Function / Enter switch 511 and Sele described later are provided. The ct / Cancel switch 512 is included.   Further, the correction means 36 selects the carat weight calculated by the calculation means 33. The correction value is added, and an adding circuit 361 is provided.

[0022]   The display unit 4 displays the carat weight calculated by the calculation unit 33 and the correction unit 36. It displays the corrected carat weight and has a liquid crystal screen. .

[0023]   The carat weighing machine 1 having such a structure is attached to the tip of the base 21. The case 5 is provided, and the detection of the arithmetic unit 3 and the measuring unit 2 described above is included in the case 5. Means 25 are housed. The case 5 has a substantially rectangular parallelepiped shape and includes the first jaw 2 2A, 22B and a surface 51 parallel to the longitudinal direction of the second jaws 23A, 23B and It has a back surface (not shown) and two side surfaces orthogonal to the longitudinal direction.

[0024]   The display portion 4 described above is formed on the surface 51, and the ease of gripping is improved. A texture pattern is formed. Furthermore, on this surface 51, Function / Enter Operation switches such as a switch 511 and a Select / Cancel switch 512 are provided. ing. Operate the Function / Enter switch 511 and Select / Cancel switch 512. By making it, you can select and confirm the specific gravity, cutting coefficient, and correction value of gem 100. it can.

[0025]   Of the two side surfaces, the side surface (not shown) on the second jaw 23A, 23B side is A lamp screw 521 is provided. This clamp screw 521 secures the movable member 24. It is fixed to the base 21.   Also, of the two side surfaces, a movable portion is provided on the side surface 53 on the first jaw 22A, 22B side. An operation unit 531 for moving the material 24 is provided. This operation part 531 , The lever 532 and the lever 532 are moved along the longitudinal direction of the base 21. Rail 533. This rail 533 is formed by cutting out the side surface 53. Is made. Move the lever 532 to the base end side of the rail 533 (base 21 side). Then, the movable member 24 moves to the base end side of the base 21. Also, this lever 53 When 2 is moved to the tip side of the rail 533, the movable member 24 moves to the tip side of the base 21. Move to.

[0026]   Next, referring to the flowchart of FIG. 5 and FIGS. A measuring method using the weight measuring device 1 will be described.   First, press the Select / Cancel switch 512 to select the specific gravity of the gem 100 ( S1). Since the specific gravity of a gemstone depends on the type of gemstone, use the carat weighing machine 1 Is configured to select the specific gravity of gems by selecting the type of gems. As shown in FIG. 6, the display unit 4 shows the types of gems of DA, EM, AL, and CR. Characters are displayed, and DA, EM, A are pressed each time the Select / Cancel switch 512 is pressed. The letters L and CR flash in sequence. Press the Function / Enter switch 511 and The specific gravity is determined by determining the type.   In this embodiment, since the gem 100 is diamond, DA (specific gravity 3.52) is used. ) Is selected.

[0027]   Press the Select / Cancel switch 512 again to select the cut coefficient of the gem 100. Yes (S2).   At this time, as shown in FIG. 7, six types of pictograms indicating the types of gem cuts Is displayed on the display unit 4, and every time the Select / Cancel switch 512 is pressed, a pictogram is displayed. Rams flash in sequence. By pressing the Function / Enter switch 511, gem 100 Is determined, and the cut coefficient is determined accordingly. In this embodiment, the jewel Since 100 is a round brilliant cut, the black circle pictogram ( Selection coefficient 0.0017333).

[0028]   Next, the size of the jewel 100 is measured (S3).   The girdle portion 103 of the jewel 100 is sandwiched between the first jaws 22A and 22B, The diameter W of 1 is measured. The second diameter L is measured by the same method.   Further, the depth dimension D of the jewel 100 is measured using the second jaws 23A and 23B. To do. As shown in FIG. 8, a pin 231 provided at the tip of the second jaw 23B. Insert B into the hole (not shown) formed in the bottom surface of the ring 110 of the gemstone 100, It is brought into contact with the pavilion portion 102 of 100. In addition, the tip portion of the second jaw 23A The pin 231A provided on the jewel 100 is brought into contact with the crown portion 101 of the jewel 100. this The depth dimension D of the jewel 100 is measured by.   At this time, as shown in FIG. 9, each measurement result is digitally displayed on the display unit 4. Fu When the nction / Enter switch 511 is pressed, the measured value is confirmed. Then, the calculation means 33 Calculation is performed (S4), and the calculation result is displayed on the display unit 4 as shown in FIG. (S5).   In this embodiment, W = 6.40 mm, L = 6.42 mm, and D = 4.00 mm. Becomes 1.00 ct.

[0029]   Next, it is visually determined whether or not the calculated carat weight value needs to be corrected (S 6).   If correction is necessary, press the Select / Cancel switch 512 and then Funct. Press the ion / Enter switch 511. As a result, as shown in FIG. --2%, 3%, 5%, 8% correction value is displayed and you can select the correction value. (S7). Each time you press the Select / Cancel switch 512, the correction value flashes in sequence. It When the Function / Enter switch 511 is pressed, the correction value is confirmed.   As a result, the calculation result is corrected (S8), and as shown in FIG. The corrected carat weight value is displayed at (S9).   Since the correction value of 3% is selected in this embodiment, the corrected carat weight is 1.03. It becomes ct.

[0030]   Therefore, according to this embodiment, the following effects can be obtained.   Carat weight is measured in two steps: measurement of gem 100 size and calculation of carat weight. It can be performed by the quantity measuring device 1. Therefore, the size of the gem 100 is measured with a gauge, etc. After the measurement, compared to the conventional method of calculating the carat weight using a conversion table, It is possible to improve the sex.   Also, since it is not necessary to perform conversion using the carat conversion table as in the past, the conversion table It is possible to prevent mistakes in inputting measured values and calculation errors, and to confirm the obtained carat weight value. Reliability can be improved.

[0031]   The carat weighing machine 1 is provided with the first jaws 22A and 22B. Insert the girdle portion 103 of the jewel 100 between the first jaws 22A and 22B of the Since the first diameter W and the second diameter L can be measured, accurate measurement can be performed. It is possible. Further, the pin 231B at the tip of the second jaw 23B is attached to the ring 110. Insert the pin 231A at the tip of the second jaw 23A into the hole of the jewel 100. The jewel 100 can be attached to a pedestal such as the ring 110 by abutting on the ring portion 101. Even when worn, it is possible to accurately measure the depth dimension D of the gem 100. It will be possible. In this way, the second portion having the pins 231A and 231B provided at the tip end thereof Since the jaws 23A and 23B and the first jaws 22A and 22B are included, The carat weight of the gem 100 attached to the pedestal such as the g 110 is highly accurate. Can be measured.

[0032]   The computing unit 3 has a storage means 31, and the storage means 31 has a plurality of types of gems in advance. The specific gravity of is stored. Therefore, the carat weighing machine 1 can be used for multiple types of gems. It can be used to measure and improve the convenience of the carat weighing machine 1. You can

[0033]   Furthermore, in order to measure the carat weight more accurately, the cut state of the gem 100 should be adjusted. It is necessary to calculate the carat weight in consideration. In the present embodiment, the correction value selection means By providing 35 and the correction means 36, the reliability of the calculated carat weight value can be improved. It can be further improved.   In addition, since a plurality of correction values are input in advance in the storage means 34, the correction value input You can save the effort of inputting force and improve the usability of the carat weighing machine 1. Can be made.

[0034]   When selecting the cutting factor of the jewel 100, the display section 4 shows a pie cut shape indicating the cut shape of the jewel. Is displayed. This makes it easy for the measurer to cut the jewel 100. Therefore, the carat weight can be easily measured.   Further, since the operation portion 531 of the movable member 24 is provided on the side surface 53 of the case 5, It is possible to move the movable member 24 while gripping the case 5 with the hand. Therefore, since the gem 100 can be fixed with the other hand, It is easy to measure size.   Further, in this embodiment, since the display unit 4 is formed on the case 5, the measurement result is The result can be confirmed and grasped immediately.

[0035]   It should be noted that the present invention is not limited to the above-described embodiment, and the object of the present invention is achieved. Modifications, improvements, etc. within the scope that can be achieved are included in the present invention.   For example, in the above-described embodiment, the operation portion 531 on the side surface 53 of the case 5 is the lever 5 32 and the rail 533 are provided, the present invention is not limited to this. It may be a pressing roller or the like.   Further, the operation portion 531 may not be provided, and the movable member 24 can be directly moved by hand. You may do it.

[0036]   Further, in the above-described embodiment, the correction values, the specific gravity of jewels, etc. are stored in the storage means 34, 31. Although stored, the storage means 34 and 31 may be omitted. In this case, the correction value and gem 1 The specific gravity of 00 may be input each time it is measured. If you do this, the time and effort of inputting Despite this, the number of components can be reduced and the carat weight scale can be saved. It can be valued.   If accurate calculation of carat weight is not required, the correction means 36 is provided. It does not have to be scraped. Carat weight scale is inexpensive by omitting the correction means 36 It can be anything.

[0037]   In the above-described embodiment, the detection unit 25 of the calculation unit 3 and the measurement unit 2 is housed in the case 5. It is said that they are stored, but these do not have to be stored in the case 5. For example , The calculation unit 3 is provided on a personal computer, etc., and the measurement results of the size of the jewel 100 are measured on the personal computer. Alternatively, the calculation unit 3 may perform the calculation.   Further, although the display unit 4 is a liquid crystal screen in the above embodiment, the present invention is not limited to this. Instead, it may be printed on paper or the like and displayed. The calculation result is displayed on the display unit 4. Not only is it displayed on the screen, but even if the calculation result can be output as a signal to the outside? Good.

[0038]

[Effect of device]

  According to the present invention as described above, the carat weight measurement capable of improving the workability can be achieved. This has the effect of providing a meter.

[Brief description of drawings]

FIG. 1 is a perspective view showing a carat weighing machine according to an embodiment of the present invention.

FIG. 2 is a plan view of a jewel.

FIG. 3 is a front view showing a jewel.

FIG. 4 is a block diagram showing the carat weighing machine.

FIG. 5 is a flowchart showing a measurement procedure using the carat weight measuring device.

FIG. 6 is a diagram showing a display state of a display unit of the carat weight measuring device.

FIG. 7 is a diagram showing a display state of a display unit of the carat weighing machine.

FIG. 8 is a diagram showing a method for measuring the depth dimension of a jewel.

FIG. 9 is a diagram showing a display state of a display unit of the carat weight measuring device.

FIG. 10 is a diagram showing a display state of a display unit of the carat weight measuring device.

FIG. 11 is a diagram showing a display state of a display unit of the carat weight measuring device.

FIG. 12 is a diagram showing a display state of a display unit of the carat weight measuring device.

[Explanation of symbols]

1 carat weighing machine 2 measuring section 3 operation part 4 Display 5 cases 21 base 22A, 22B The first jaw 23A, 23B The second jaw 24 Movable member 25 Detection means 31 storage means 32 selection means 33 computing means 34 storage means 35 Correction value selection means 36 Correction means 52 side 100 jewels 101 Crown 102 Pavilion Department 103 Girdle part 231A, 231B pin 531 Operation unit

Claims (8)

[Scope of utility model registration request] 1. A carat weight measuring instrument for measuring a carat weight of a gemstone having a crown portion, a pavilion portion and a girdle portion which is cut, and a measuring portion for measuring a size dimension of the gemstone, And a display unit for displaying the carat weight calculated by the calculation unit, wherein the measurement unit moves along the longitudinal direction of the base. A movable member that can be provided, and a pair of first jaws that are provided so as to face the base and the movable member and that measure a first diameter and a second diameter of the girdle portion of the jewel that are orthogonal to each other; A pair of second jaws, which are provided to face the base and the movable member and have a pin for measuring the depth dimension of the jewel, formed at the tip, and a moving amount of the movable member with respect to the base. And a detection unit for detecting the cutoff coefficient based on the specific gravity and shape of the gemstone, and the detection unit of the measurement unit and the specific gravity and cutoff coefficient selected by the selection unit. And a calculation means for calculating the carat weight of the gemstone based on the measured value. 2. The carat weight measuring device according to claim 1, wherein the arithmetic unit has a storage unit for storing specific gravities and a plurality of cut coefficients of a plurality of types of jewels, and the selection unit is a storage unit for storing the specific gravity. A carat weighing machine characterized by selecting a specific gravity and a cut coefficient of a predetermined gemstone. 3. The carat weight measuring device according to claim 1, wherein the arithmetic unit selects a correction value selecting a correction value according to a cutting state of the jewel, and the correction value selected by the correction value selecting unit. And a correction unit that corrects the calculation result by the calculation unit, wherein the display unit displays the corrected calculation result. 4. The carat weight measuring apparatus according to claim 2, wherein the arithmetic unit selects a correction value selecting a correction value according to a cut state of the jewel, and the correction value selected by the correction value selecting unit. And a correction unit that corrects the calculation result by the calculation unit, wherein the display unit displays the corrected calculation result. 5. The carat weight measuring device according to claim 3, wherein the computing unit has a storage unit that stores in advance a plurality of correction values according to the cut state of the jewel, and the correction value selecting unit includes: A carat weighing machine characterized in that a predetermined correction value is selected from the storage means. 6. The carat weight measuring device according to claim 4, wherein the arithmetic unit has a storage unit that stores in advance a plurality of correction values according to a cut state of the jewel, and the correction value selecting unit, A carat weighing machine characterized in that a predetermined correction value is selected from the storage means. 7. The carat weighing machine according to claim 1, further comprising a substantially rectangular parallelepiped case provided at one end of a base of the measuring unit and having the display unit formed thereon. A carat weight measuring instrument characterized in that an operating portion for moving the movable member is provided on a side surface of the case orthogonal to a longitudinal direction of the jaw. 8. The carat weight measuring instrument according to claim 6, further comprising a substantially rectangular parallelepiped case provided at one end of the base of the measuring unit and having the display unit formed thereon. A carat weight measuring instrument characterized in that an operating portion for moving the movable member is provided on a side surface of the case orthogonal to a longitudinal direction of the jaw.